Improvement in rotary pumps



C. P. HOLMES.

. Rotary Pumps.

No. 124,820. Patented March19,1872.

Witnesses: Inyentor WZaMM/j i flttorneys.

in their proper position.

Unrrnn S'mrns CLARK P. HOLMES, OF HAVANA, NEW YORK.

IMPROVEMENT I N ROTA'RYVPUMPS.

Specification forming part of Letters Patent No. 124,820, dated March 19, 1872.

To all whom it may concern:

Be it known that I, CLARK P. HOLMES, of Havana, in the county of Schuyler and in the State of New York, have invented certain new and useful Improvements in Rotary Pump and Fire-Engine; and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing and to the letters of reference marked'thereon making a part of this specification.

The nature of my invention consists in the construction and arrangement of a rotary i in the same, and Fig. 4 is a perspective view of a cam located inside of the shell.

A represents the outer shell of my pump, and B the interior hub or cylinder, through which the shaft G passes. The hub or cylinder B is made of sufficient size to leave a water-space between it and the shell A, and is also slotted at two opposite points to a suitable depth to receive and hold the valves D D Thesetwo slots are connected by a passage through the hub and the shaft, in whichisplaced aspring, E, which bears against the inner ends of both valvesD 1) and holds themout against the rim or shell A. In each end of the hub or cylinder B is an annular recess, a, provided with a passage,

1), leading to the outer circumference of the hub, for the purpose of venting the spaces 00- cupied by the valves D when pressed down,

and also packing or preventing the water from passing across the ends of the hub or cylinder. G is the suction opening, and Hthe discharge opening of the shell. Between these two openings on the inside of the shell is secured a cam, J, by means of the screw (1, for the purpose of pressing in the valves D D and making a continuous circle of the hub or cylinder, the valves sweeping in a true circle with the center, having no sliding motion while in labor. The cam. J is provided with recesses e e, for the purpose of venting the space between the edge of the valve and the center of the cam,'so' that when the cylinder is revolved the force of wa ter against the cam will not check or retard the operation of the pump, but will allow the waste water to pass through the recesses and pass out the outlet G.

Having thus fully described my invention, what I claim as new, and desireto secure by Letters Patent, is

1. Thehub or cylinderB, provided at each end with an annular recess, a, and passage 1), substantially as and for the purposes herein set forth.

2. The cam J, provided with the recesses c e, in combination with the cylinder B and its pistons D D, substantially as and for the purposes herein set forth.

3. The combination of the shell A with open ings G H, hub B with recesses a and passages b, valves D, spring E, and cam J with recesses c, all constructed and arranged substantially as and for the purposes herein set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 18th day of January, 1872.

CLARK P. HOLMES.

Witnesses:

G. L. Evnnr, J omv SMITH. 

